Cutterhead inserts for an industrial woodworking machine

ABSTRACT

A cutterhead for an industrial woodworking machine comprising a cutterhead body having a cylindrical outer surface with at least one insert-receiving groove extending into the body from the outer surface; at least one cutting insert secured in the groove, the insert being comprised of an insert body, a blade attachment gib, and at least one detachable blade, each blade being secured adjacent the insert body by the blade attachment gib. The upper end of the gib preferably projects above the cutterhead body and is adapted to turn chips from the blades, which project above the attachment gib. Fasteners secure the blades between the body and the attachment gib, and the insert in the groove.

BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates generally to rotary cutter heads forindustrial wood working machines, more particularly, to improved cuttinginserts for use in cutterheads for peripheral milling machines,including high speed planers and molders.

(2) Description of the Prior Art

Historically, rotary cutterheads used in industrial wood workingmachines, such as high speed planers, have been characterized by designshaving straight, high speed steel knives clamped in the cutterhead body.More recently, stagger tooth arrangements for noise reduction andcutterheads with large numbers of knife rows for increased feed rateswithout increased RPM's have been introduced. The clamped-in-place solidknife design does not lend itself to the use of tool material other thanhigh speed steel, because the replacement of knives is often tedious andcostly. In addition to limitations on the types of cutting materialsthat can be used, there are also limitations on the ability to adjustthe position of the cutting blades to meet different machiningrequirements.

U.S. Pat. No. 5,002,104 issued to John S. Stewart, the present inventor,the patent being incorporated herein by reference in its entirety,describes improved cutterheads with a sufficient number of knife rows topermit a staggered tooth arrangement for noise reduction or,alternatively, to provide an improved surface finish at higher feedrates without increasing cutterhead RPM, and provides for the generationof a variety of shapes when used with appropriately shaped individualcutting inserts.

The cutterhead described in the above patent is comprised of acutterhead body and a plurality of removable cutting inserts attached tothe body. The cutterhead body comprises a cylindrical portion having aplurality of circumferentially spaced grooves extending into thecutterhead body from the periphery thereof, which are adapted to receivethe cutting inserts. A portion of the side walls of each groove isinwardly converging to substantially equally divide the forces exertedby the removable cutting insert between groove side walls, substantiallyreducing the circumferential spacing required between adjacent grooves.

Each of the cutting inserts used with the above cutterhead body includesa generally parallelepiped body having a blade aligned along its forwardupper edge and a gullet portion aligned along its rear edge. Elongatedslots in the body permit lateral adjustment along the axis of thecutterhead. The blade, which may be brazed on, mechanically fastened, orwelded onto the insert body, has a generally L-shaped cross section,with an angular cutting edge for engaging the wood being cut, and ashoulder projecting below and in front of the blade to receive andassist in turning of chips in cooperation with the gullet of an adjacentcutting insert.

Individual cutting inserts in the above cutterhead can be replaced ifbroken or have otherwise reached the end of their useful life byexchanging the old cutting insert with a new cutting insert, therebyreducing the number of cutterheads required for a particular operation.The removed cutting insert can then be discarded or retipped with newcutting material. Alternately, worn inserts can be reground, eitherindividually or in the assembled cutterhead. The new or reground insertscan be precisely installed and adjusted in the cutterhead body either onor off the machine.

While the foregoing cutterhead is a significant improvement over earliercutterheads, further improvements are still desirable. For example,replacement of cutting inserts in the above-described cutterhead of U.S.Pat. No. 5,002,104 requires that the entire insert be replaced and theblade retipped. While this procedure is a substantial improvement overreplacing solid, full-length cutterhead knives in the field, furtherconvenience and savings are desirable. The current commercially feasiblemanner of attaching the blade to the cutting insert body, as shown inthe U.S. Pat. No. 5,002,104 patent, is to braze or weld the blade ontothe body, resulting in cutting blades that are difficult and expensiveto refurbish, requiring extensive tool shop capabilities.

Therefore, it is a primary object of the present invention to provide animproved cutting insert having blades, which form the cutting edge, thatcan be quickly and economically replaced in the field. It is a furtherobject of the invention to provide cutting inserts having blades thatwill withstand high impacts without damage due to elimination of brazingstresses. Another object of the invention is to provide a cutting insertstructure permitting a wider use of cutting edge materials to meetvarious requirements. It is yet another object of the present inventionto provide improved cutting inserts for cutterheads having theseimprovements.

SUMMARY OF THE INVENTION

The present invention is directed to improved cutterheads and toremovable cutting inserts utilizable in cutterheads for an industrialwoodworking machine, such as high speed planers and molders. Thesecutterheads include a generally cylindrical body secured onto arotatable shaft by a locking means. The body contains a plurality ofnormally circumferentially spaced insert-receiving grooves extendinginto the cutterhead body from the outer surface. A plurality of cuttinginserts are secured within the grooves.

The cutting inserts, to be described in detail hereinafter, have sidewalls that mate with complementary angled side walls of the grooves,thereby producing a wedging action to secure the cutting inserts intothe grooves. For example, truncated V-shaped grooves may be used toreceive an insert having a bottom surface with rear and front edges, andrear and front walls extending outwardly at diverging angles from therear and front edges of the bottom surface to the body outer surface.The angle between the bottom surface and rear wall will normally beequal to the angle between the bottom surface and the front wall.

Attachment means is provided for removably securing the cutting insertinto the groove. The attachment means may include a plurality ofthreaded apertures spaced, e.g., one inch apart, along the bottomsurface of each of the grooves. The cutting inserts have aperturesextending through the insert body. Fasteners extend through the insertbody and engage the cutterhead apertures to secure the insert to thebody.

In the preferred embodiment, the cutting insert is comprised of a bladeholder having a chip-turning front shoulder preferably adapted toproject slightly above the cutterhead body surface when the insert issecured in the groove, and detachable cutting blades mechanicallysecured into the holder behind the front shoulder. Each blade has acutting edge projecting above the holder and the front shoulder. Anattachment means secures the blades into the holder. The attachmentmeans may include a blade attachment plate integrally formed with theinsert body, with a slot behind the chip-turning shoulder to receivedthe blades. Preferably, the blade holder is comprised of an insert bodyand at least one separate blade attachment gib, with the upper part ofthe blade attachment gib forming the front shoulder. In this structure,the blades are sandwiched between the blade attachment gib and theinsert body.

The insert body is generally formed of a solid metal piece having topand bottom surfaces and side walls, and an angular front bladeattachment wall. A blade support ledge, integral with the insert body,projects forward from the lower part of the body below the bladeattachment wall, and includes a top surface and an angled front wall.

The top surface of the body is generally planar with a front edge and arear edge. A gullet along the rear edge aids in removing chips beforethey reach the next cutting blade. The bottom surface of the body isgenerally beneath and parallel to the top surface and has a rear edgeand a front edge. The outwardly angled rear wall extends upwardly fromthe rear edge of the bottom surface to the rear edge of the top surface.

The blade attachment gib used to secure the blades to the insert body isdisposed in front of the blade. The blade attachment gib has an upperedge adapted to project above the cylindrical body surface when thecutting insert is secured in the receiving groove, a lower edge adaptedto locate immediately adjacent to the blade support ledge, a rear faceadapted to mate against the front face of the blade, and a front faceadapted to be positioned against the front wall of the cutterhead bodygroove. The gib may have an attachment opening extending from the frontface to the rear face for use in attaching the blade. Preferably, theblade attachment gib is separate from the insert body, which facilitatesmanufacturing and permits the use of different materials in themanufacture of the body and the gib.

Also, in the preferred embodiment, at least two detachable blades aresecured between the blade attachment gib and the blade attachment wall.Alternately, a longer single blade may be provided instead of twoseparate blades. The blades, which will normally be formed of high speedsteel or other hard material such as carbide, each have a rear face, afront face, an angular, upper edge extending above the top surface ofthe insert body, and a lower edge adapted to rest on the blade supportledge. Each blade may include attachment openings extending from itsfront face to its rear face. While the individual blades illustrated inthe preferred embodiment of the invention each have a continuous-typecutting edge, it will be apparent that other shapes, such as thoseillustrated in the above Stewart patent can also be used.

First attachment means are used to secure the blades to the insert bodybetween the blade attachment gib and the blade attachment wall. Thefirst attachment means may be threaded fasteners such as bolts thatextend through openings in the blade attachment gib and blades and intothreaded recesses in the insert body. The heads of these fasteners arerecessed into the attachment gib so that they do not project beyond thegib front face. Also, second attachment means are used to secure theentire cutting insert into the cutterhead body groove. These secondattachment means may also be threaded fasteners such as bolts thatextend through openings in the insert body and into threaded recesses atthe bottom of the groove. The heads of these fasteners will be recessedinto the insert body, so that they do not project above the top surfaceof the insert body.

The cutting insert is assembled by placing the blades against the bladeattachment wall of the body insert with the lower edges of the bladesresting on the ledge. The blade attachment gib is then positioned infront of the blades. Fasteners are then inserted through apertures inthe plate and blades and threaded into apertures in the insert body.When tightened, the fasteners will be recessed into the blade attachmentgib.

The assembled cutting insert is then placed in a groove of thecutterhead body, and other fasteners are inserted through apertures inthe insert body and into threaded apertures in the cutterhead body atthe bottom of the groove. When inserted in the groove, the cutting tipsof the blades will project above the surface of the cutterhead bodysurface. Also, the upper edge or shoulder of the blade attachment gibwill preferably project above the cutterhead body surface in front ofthe blades. When the cutting insert is secured in the cutterhead groove,the front wall of the blade attachment gib preferably contacts thegroove and is wedged against the front wall of the groove. As a result,the blades are secondarily clamped by this wedging action so that thefasteners holding the gib and blades to the insert body cannot loosen.Thus, the blades are held tightly in position during use of thecutterhead.

During use, the cutting edge of each blade removes a chip from theworkpiece. The chip is directed from the cutting edge to the upper edgeor shoulder of the blade attachment gib which, in cooperation with thegullet of the adjacent insert, turns the chip.

When replacement of a blade is desired, the insert is removed from thecutterhead groove by removing the threaded fasteners holding the insertto the cutterhead body and the fasteners holding the gib and the bladesto the insert body. The old blade can be removed, and a new bladeinserted in its place.

Accordingly, one aspect of the present invention is to provide aremovable cutting insert for use in a cutterhead for an industrialwoodworking machine, the cutterhead including a generally cylindricalbody having an outer surface, an insert-receiving groove extending intothe cutterhead body from the outer surface, and means for removablysecuring the cutting insert in the groove, the cutting insert including:(a) a blade holder having a front shoulder; and (b) at least onedetachable blade secured into the holder behind the front shoulder, theblade having a cutting edge projecting above the holder and the frontshoulder.

Another aspect of the present invention is to provide a removablecutting insert for use in a cutterhead for an industrial woodworkingmachine, the cutterhead including a generally cylindrical body having anouter surface and an insert-receiving groove extending into thecutterhead body from the outer surface, and means for removably securingthe cutting insert in the groove, the cutting insert including: (a) aninsert body having a front wall; (b) at least one blade attachment gibpositioned in front of the insert body front wall; (c) at least onedetachable blade secured to the front wall behind the blade attachmentgib, the blade having an upper edge projecting above the insert body andthe blade attachment gib when the insert is secured in the bladereceiving groove; and (d) attachment means for securing the bladebetween the blade attachment gib and the front wall.

Another aspect of the present invention is to provide a removablecutting insert for use in a cutterhead for an industrial woodworkingmachine, the cutterhead including a body having a cylindrical outersurface and an insert-receiving groove extending into the cutterheadbody from the surface, the groove having a bottom surface and rear andfront walls extending outwardly from bottom surface, the cutting insertincluding: (a) an insert body having a top surface with a front and rearedges, a bottom surface having rear and front edges spaced beneath andsubstantially parallel to the top surface, a gullet having a front edgeintegral with the rear edge of the top surface and a rear edge, anoutwardly angled rear wall having an upper edge integral with the rearedge of the gullet and a lower edge integral with the rear edge of thebottom surface, an outwardly angled front wall having a top edgeintegral with the front edge of the top surface and a bottom edge belowthe top surface, and a blade support ledge extending forward from thefront wall, the front wall having an aperture therein; (b) at least onedetachable blade having a rear face secured to the insert body frontwall, a front face, an angular upper edge projecting above the topsurface of the insert body and the cutterhead body surface when theinsert is secured in the insert-receiving groove, and a lower edgesupported on the blade support ledge, the blade having an apertureextending therethrough; (c) at least one blade attachment gib secured infront of the blade, a lower edge adjacent to the blade support edge, arear face mating against the front face of the blade, and a front faceadapted to be positioned against the front wall of the cutterhead bodygroove, the gib having an aperture therethrough; and (d) a fastenerprojecting through the apertures in the blade attachment gib and bladesand into the apertures in the insert body.

Another aspect of the present invention is to provide a cutterheadincluding: (a) a cutterhead body having an outer surface, aninsert-receiving groove extending into the cutterhead body from theouter surface, and means for removably securing a cutting insert in thegroove; (b) a removable cutting insert having a blade holder and atleast one detachable blade secured into the holder behind the frontshoulder, the blade having a cutting edge projecting above the holderand the front shoulder.

Still another aspect of the present invention is to provide a cutterheadfor an industrial woodworking machine including: (a) a cutterhead bodyhaving a cylindrical outer surface and at least one insert-receivinggroove extending into the body from the outer surface; (b) at least onecutting insert secured in the groove, the insert being comprised of aninsert body having a front wall, at least one blade attachment gibpositioned in front of the front wall and projecting above the outersurface, and at least one detachable blade secured behind the bladeattachment gib and projecting above the insert body and the bladeattachment gib; and (c) first attachment means securing the blade behindthe blade attachment gib; and (d) second attachment means securing theinsert in the groove.

These and other aspects of the present invention will be more clearlyunderstood after review of the following description of the preferredembodiment of the invention when considered with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top view of a cutterhead constructed according to thepresent invention;

FIG. 2 is an enlarged, partial end view of the cutterhead of FIG. 1;

FIG. 3 is a perspective view of the cutting insert of the presentinvention;

FIG. 4 is an cross-sectional end view of the cutting insert shown, inFIG. 3; and

FIG. 5 is an exploded, perspective view of the cutting insert of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings in general, it will be understood that theillustrations are for the purpose of describing a preferred embodimentof the invention and are not intended to limit the invention thereto.

As best seen in FIG. 1, a cutterhead, generally designated 10, is shownconstructed according to the present invention. The cutterhead includesa cylindrical cutterhead body 12. The overall dimensions of body 12typically will have a diameter of between about five and fifteen inchesand a length of between about two and twenty inches, but the actualdimensions are dependent on the requirements of the individual woodworking machine. In the preferred embodiment, body 12 is formed from acylinder of alloy steel.

Body 12 is attached to a high speed planer (not shown) by means of arotary shaft 14. A locking means 16, such as a keyed taper shaft andlocking nut assembly, secures body 12 to shaft 14. Longer cutterheadsmay have the shaft built into the cutterhead. Body 12 contains aplurality of truncated V-shaped grooves 18 around its periphery. Each ofthe plurality of grooves 18 includes a plurality of threaded apertures20 generally arranged along the bottom surface of each of the grooves18. In the preferred embodiment, the apertures 20 are spaced about oneinch apart.

Grooves 18 are shaped to receive a plurality of individual cuttinginserts, generally 22. As best seen in FIGS. 3-5, each cutting insert 22is comprised of an insert body 24, detachable blades 26, and a bladeattachment gib 28. As best seen in FIG. 2, cutting inserts 22 mate withgrooves 18. Insert body 24 is generally formed of a solid metal piecehaving a top surface 30, a bottom surface 32, side walls 34 and 36, arear wall 38 and an angular front blade attachment wall 40. A bladesupport ledge 42 projects forward from the lower part of body 24 belowblade attachment wall 40.

Top surface 30 of body 24 is generally planar with a gullet 44 along itsrear edge to receive, and aid in turning, chips. Bottom surface 32 isgenerally below, and parallel to, top surface 30. Outwardly angled rearwall 38 extends upwardly from the rear edge of bottom surface 32 to therear edge of the top surface 30.

Cutting insert 22 preferably includes a pair of counterbored and slottedapertures 46 for receiving attachment means 48. Each aperture 46includes a contact shoulder portion 50 and a slot portion 52.Preferably, apertures 46 are equally spaced from the longitudinal endsof the cutting inserts 22 and one another, thereby distributing the loadof the attachment means 48. Also, in the preferred embodiment,attachment means or fastener 48 is a threaded fastener having a threadedbody 54 and an enlarged cap 56 adapted to contact shoulder 50. Flatwashers (not shown) may be located between the enlarged cap 56 and thecontact shoulder portion 50.

Each of the apertures 46, shoulder portion 50, and slot portion 52 areadapted to receive fasteners 48 while, at the same time, permitting eachof the fasteners 48 to move laterally along the horizontal axis of thecutting inserts 22 within each of the apertures 46. This constructionpermits lateral movement of the cutting inserts 22, thereby facilitatingthe adjustment of profile shapes required at initial setup or afterreworking, regrinding, etc.

Cutting inserts 22 preferably are approximately two inches in overalllength so that material surfaces up to two inches in width can besurfaced with only one insert per row. Cutting inserts 22 may be abuttedtogether to produce increases in cutting widths in two inch increments,thereby reducing the number of cutterheads 10 required for high speedmachines producing more than one product.

Blade attachment gib 28, used to secure blade 26 to insert body 24, hasan upper edge 58 preferably adapted to project above the surface ofcutterhead body 12 when insert 22 is secured in insert-receiving groove18, a lower edge 60 adapted to locate immediately adjacent or rest onthe blade support ledge 42, a rear face 62, and a front face 64 adaptedto be positioned against the front wall of cutterhead body groove 18.Gib 28 includes apertures 66 extending from front face 64 to rear face62, which are used in attaching blade 26.

Each detachable blade 26, secured between blade attachment wall 40 andgib 28, has an angular, upper edge 70 extending above top surface 30 ofinsert body 22, a lower edge 72 adapted to rest on blade support ledge42, a rear face 74, and a front face 76. Each blade 26 includesapertures 78 extending from front face 76 to rear face 74. As shown inthe drawings, the preferred embodiment of the cutting insert 22 includestwo separate blades 26 disposed side-by-side between the gib 28 and theblade attachment wall 40. Alternately, a single longer blade can beprovided, which extends across substantially the entire width of thecutting insert 22.

Attachment means or fasteners 80 extend through apertures 78 and 66 andinto threaded recesses 25 in insert body 24 to secure blades 26 betweenblade attachment gib 28 and blade attachment wall 40. Fasteners 80 arerecessed into attachment gib 28 so that they do not project beyond thefront face 64 thereof.

Certain modifications and improvements will occur to those skilled inthe art upon reading of the foregoing description. By way of example,the overall shape of the cutting inserts can be modified to fit intocutterhead bodies other than the type specifically described. Also, theblade support ledge can be formed as a part of the blade attachment gibinstead of the insert body or, for some applications, eliminatedentirely. In addition, either two short or one long blade can beprovided. Likewise, the gib could also be either one long gib as shownor two short gibs, one for each of two blades. It should be understoodthat all such modifications and improvements have been deleted hereinfor the sake of conciseness and readability but are properly within thescope of the following claims.

I claim:
 1. A removable cutting insert for use in a cutterhead for anindustrial woodworkng machine, said cutterhead including a generallycylindrical body having an outer surface, an insert-receiving grooveextending into said cutterhead body from the outer surface, and meansfor removably securing said cutting insert in said groove, said cuttinginsert comprising:(a) a blade holder having a front blade attachmentwall; and (b) at least one detachable blade secured into said holderadjacent said front blade attachment wall, said blade having a cuttingedge projecting above said holder and said front blade attachment wall,wherein said blade holder is comprised of an insert body and at leastone blade attachment gib, said blade being secured between said body andsaid gib.
 2. The cutting insert of claim 1, further including attachmentmeans for securing said blade into said holder.
 3. The cutting insert ofclaim 1, wherein said blade holder includes a blade support ledge belowsaid blade.
 4. The cutting insert of claim 1, wherein said groove andsaid holder have corresponding, outwardly projecting walls.
 5. Thecutting insert of claim 1, wherein said front blade attachment wall ofsaid blade holder is adapted to project above said cutterhead bodysurface when said insert is secured in said groove.
 6. The cuttinginsert of claim 1, wherein there are at least two detachable bladessecured side-by-side in said holder adjacent said front blade attachmentwall.
 7. A removable cutting insert for use in a cutterhead for anindustrial woodworking machine, said cutterhead including a generallycylindrical body having an outer surface and an insert-receiving grooveextending into said cutterhead body from the outer surface, and meansfor removably securing said cutting insert in said groove, said cuttinginsert comprising:(a) an insert body having a front wall; (b) at leastone blade attachment gib positioned adjacent said insert body frontwall; (c) at least one detachable blade secured to said front walladjacent said blade attachment gib, said blade having an upper edgeprojecting above said insert body and said blade attachment gib whensaid insert is secured in said blade receiving groove; and (d)attachment means for securing said blade between said blade attachmentgib and said front wall.
 8. The cutting insert of claim 7, wherein saidinsert body includes a forward projecting ledge beneath said blade. 9.The cutting insert of claim 7, wherein said insert body comprised a topsurface, a bottom surface below and parallel to said top surface,outwardly projecting rear and front walls extending from said bottomsurface to said top surface, said rear and front walls being joined tosaid bottom surface at approximately equal angles.
 10. The cuttinginsert of claim 7, wherein said insert body, said blade and said gibinclude corresponding apertures, and said attachment means is comprisedof fasteners extending though said blade and gib apertures and into saidinsert body apertures.
 11. The cutting insert of claim 10, wherein saidfasteners include a threaded body and a head, said head being recessedinto said gib when said gib and blade are secured to said body.
 12. Thecutting insert of claim 7, wherein said gib includes an upper edgeadapted to project above said cylindrical body surface when said insertis secured in said blade receiving groove.
 13. The cutting insert ofclaim 7, wherein there are at least two detachable blades securedside-by-side to said front wall adjacent said blade attachment gib. 14.A removable cutting insert for use in a cutterhead for an industrialwoodworking machine, said cutterhead including a body having acylindrical outer surface and an insert-receiving groove extending intosaid cutterhead body from said surface, said groove having a bottomsurface and rear and front walls extending outwardly from bottomsurface, said cutting insert comprising:(a) an insert body having a topsurface with front and rear edges, a bottom surface having rear andfront edges spaced beneath and substantially parallel to said topsurface, a gullet having a front edge integral with the rear edge ofsaid top surface and a rear edge, an outwardly angled rear wall havingan upper edge integral with the rear edge of said gullet and a loweredge integral with the rear edge of said bottom surface, an outwardlyangled front wall having a top edge integral with the front edge of saidtop surface and a bottom edge below said top surface, and a bladesupport ledge extending forward from said front wall, said front wallhaving an aperture therein; (b) at least one detachable blade having arear face secured to said insert body front wall, a front face, anangular upper edge projecting above the top surface of said insert bodyand said cutterhead body surface when said insert is secured in saidinsert-receiving groove, and a lower edge supported on said bladesupport ledge, said blade having an aperture extending therethrough; (c)at least one blade attachment gib secured adjacent said blade, said gibhaving an upper end, a lower edge adjacent to said blade support ledge,a rear face mating against the front face of said blade, and a frontface adapted to be positioned against the front wall of said cutterheadbody groove, said gib having an aperture therethrough; and (d) afastener projecting through the apertures in said blade and bladeattachment gib and into the apertures in said insert body.
 15. Thecutting insert of claim 14, wherein said upper edge of said gib projectsabove said cutterhead surface when said insert is secured in said bladereceiving groove.
 16. The cutting insert of claim 14, wherein there areat least two detachable blades secured side-by-side to said insert bodyfront wall.
 17. A cutterhead comprising:(a) a cutterhead body having anouter surface, an insert-receiving groove extending into said cutterheadbody from said outer surface, and means for removably securing a cuttinginsert in said groove; (b) a removable cutting insert having a bladeholder with a front blade attachment wall; and at least one detachableblade secured into said holder adjacent said front blade attachmentwall, said blade having a cutting edge projecting above said holder andsaid front blade attachment wall, wherein said blade holder is comprisedof an insert body and at least one blade attachment gib, said bladebeing secured between said body and said gib.
 18. The cutterhead ofclaim 17, further including first attachment means for securing saidblade into said holder, and second attachment means for securing saidinsert in said groove.
 19. The cutterhead of claim 17, wherein saidblade holder includes a blade support ledge below said blade.
 20. Thecutterhead of claim 17, wherein said groove and said holder havecorresponding, outwardly projecting walls.
 21. The cutterhead of claim17, wherein said front shoulder of said blade holder is adapted toproject above said cutterhead body outer surface when said insert issecured in said groove.
 22. The cutterhead of claim 17, wherein thereare at least two detachable blades secured side-by-side into saidholder.
 23. A cutterhead for an industrial woodworking machinecomprising:(a) a cutterhead body having a cylindrical outer surface andat least one insert-receiving groove extending into said body from saidouter surface; (b) at least one cutting insert secured in said groove,said insert being comprised of an insert body having a first wall, atleast one blade attachment gib positioned adjacent said first wall, andat least one detachable blade secured adjacent said blade attachment giband projecting above said insert body and said blade attachment gib; and(c) first attachment means securing said blade adjacent said bladeattachment gib; and (d) second attachment means securing said insert insaid groove.
 24. The cutterhead of claim 23, wherein said insert bodyincludes a forward projecting ledge beneath said blade and saidattachment gib.
 25. The cutterhead of claim 23, wherein said insert bodyand said groove include corresponding, outwardly projecting rear andfront walls.
 26. The cutterhead of claim 23, wherein said insert body,said blade, and said gib include corresponding apertures, and said firstattachment means is comprised of fasteners extending through said bladeand gib apertures and into said insert body apertures, said fastenersincluding a threaded body and a head recessed into said gib.
 27. Thecutterhead of claim 23, wherein said blade attachment gib projects abovesaid cylindrical outer surface.
 28. The cutterhead of claim 23, whereinthere are at least two detachable blades secured side-by-side adjacentsaid blade attachment gib.